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Old 01-11-2005, 07:11 AM   #1
red3100
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Gm Th400

I bought a old chevy truck that has a GM TH400 transmission in it. The truck was not running at the time (project) I got the motor running but need to figure out the trans. Does the TH400 have a kickdown cable? If so were does it go on the trans. Were does the Speedo hook up? And there looks to be a vacuum value on the right side. Any Ideals?
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Old 01-12-2005, 08:58 PM   #2
troy1
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Re: Gm Th400

no kickdown on a 400 they use the modulator (vac. line hook up there) is the truck a 4x4 its on the transfer case if its a 2WD its on the driver side rear of the case
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Old 01-13-2005, 07:48 AM   #3
red3100
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Re: Re: Gm Th400

Quote:
Originally Posted by troy1
no kickdown on a 400 they use the modulator (vac. line hook up there) is the truck a 4x4 its on the transfer case if its a 2WD its on the driver side rear of the case

The truck is 2WD. I see a modulator toward the rear passenger side of the trans and a small electrical thing on the rear driver side. Can the modulator use rubber vac. line or does it need to be a hard line.
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Old 01-18-2005, 09:38 PM   #4
troy1
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Re: Gm Th400

you can use rubber but hard line woud be better
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Old 01-20-2005, 01:34 PM   #5
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Re: Gm Th400

Quote:
Originally Posted by red3100
I bought a old chevy truck that has a GM TH400 transmission in it. The truck was not running at the time (project) I got the motor running but need to figure out the trans. Does the TH400 have a kickdown cable? If so were does it go on the trans. Were does the Speedo hook up? And there looks to be a vacuum value on the right side. Any Ideals?

The turbo 400 does use a kick down cable but instead uses a kick down solinoid which is wired to a switch that in your truck resides just under the dash above the gas petal. The turbo 400 like a 350 uses a vacuum modulator which is located on the passager side of the tranny..connect this to a manifold vacuum source. The speedo cable attaches on the drivers side just before the tail of the transmission.
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